Any idea how many OsClass sites there are?

Are there any stats on how many active OsClass sites there are? I tried using the google to find some, but all of them turned out to be either abandoned or never really got off the ground.

My main interest is choosing a product with a good active user base to ensure it will be around for awhile.

Appreciate any insight.

@David S
It's information that is hard to obtain or check, there might be few hundred of new installations every month and few thousands of well-established sites running on osclass.